Developers perspective on classification as a driver …1 Jonas Gräslund 2011 05 20 Developers perspective on classification as a driver towards net zero buildings REHVA in Tallin

Jonas Gräslund 2011 05 201

Developers perspective on classification as a driver towards net zero buildings

REHVA in Tallin 2011 05 20

Jonas Gräslund, Skanska Commercial Development Nordic


Residential Development

Commercial Development

Construction InfrastructureDevelopment

Skanska Denmark

Skanska Finland

Senior Executive Team

Group staff units

Skanska UK

Skanska Latin America

Skanska USA Civil

Skanska USA Building

Skanska Commercial Development Nordic

Skanska InfrastructureDevelopment

Skanska Norway

Skanska Sweden

Skanska Poland

Skanska Czech Republic

Skanska Commercial Development Europe

Skanska Financial Services

Skanska Project Support

Skanska ResidentialDevelopment Nordic

The Skanska Group

Skanska IT Solutions


Helicopterview on energy consumption


Indoor air quality, and productivity


Indoor climate

Source: Olli Seppänen,,Helsinki University of Technology

William Fisk, Lawrence Berkeley National Laboratory


Source: Olli Seppänen,,Helsinki University of Technology

William Fisk, Lawrence Berkeley National Laboratory


EU Green Building Certificate

Slide from Petra Hajna, CDE


LEED

Slide from Petra Hajna, CDE


Classification a driver ?

− Leed

today energy cost instead of primary energy or CO2 ?

(primary energy will be implemented in LEED 2012)

individual demand based components/controls instead of indoor

climate ?

- Green Building

only bought energy instead of primary energy in Sweden


Skanska Frameprogram a driver

− Classification

is a classification, third party evaluation

- Our own Frameprogram

is a driver, based on property and client value to be future proof


What is Skanska doing ?


Frame Program based on strategy regarding

− Low environmental impact

− Low life cycle cost

− Flexibility

− Non complex solutions


CDN Frame Program Offices today

− Waterbased solutions (= cooling beams)

− AHU without sound attenuators and with Free cooling

− Few AHU and heat recovery from all exhaust (= battery coils)


Why not only do Passive Houses ?

− Residential buildings has continous ventilation

and therefore Passive Houses uses the ventilation system to heat the

building (”passive” while no heating system)

− Commercial buildings has only 1/3 of operation of all hours

we can´t start the ventilation the other 2/3 just for heating. That would

increase the energy consumption

− The facade has less impact for commercial then for residential due to

commercial are bigger buildings (less facade area compared to building

area)


Net Zero Primary Energy

Net Zero Water

Near Zero Carbon Construction

Zero Unsustainable Materials

Zero Hazardous Materials

Zero Waste

Skanskas’ Green Map

local codes,

sta

ndard

s a

nd

regula

tions in p

lace


Strategy regarding energy

First energy efficiency

Then renewable energy


Road map for Deep Green (energy)

Solution Heating

kWh/m2ATemp

Cooling*

kWh/m2ATemp

Landlord

power**

kWh/m2ATemp

Saving

kWh/m2ATemp

Today standard

office

45 26 17 -

Low speed

ventilation

-9 - -2 -11

Passive house-

windows

-8 - - -8

Ground cooling

(Deep Green

Cooling)

-5 -26 +1 -30

Seasonal storage

Solar heating

-23 - - -23

Windpower - - -16 -16

Total 0 0 0 -88

*) Including processcooling 10 kWh/m2

**) Exclusive tenant electricity


Low speed Air Handling Unit

Air speed 1,0 m/s Heat recovery efficiency 81 %


Deep Green Cooling

Ground based bore hole storage

in normal ground temperature level

Summertime building is cooled by the storage

Wintertime storage is charged by cold

outdoor air

and the building is at the same time

preheated by the storage (supply air)

Robust solution,

(no heat pumps or chillers needed

between storage and building while using

self-regulating cooling beam system)

Pat. pended


Typical district heating in Sweden, possible solar heating

-

100 000

200 000

300 000

400 000

500 000

600 000

700 000

JANUARI

FEBRUARI

MARS

APR

IL

MAJ

JUNI

JULI

AUGUSTI

SEPTEM

BER

OKTO

BER

NOVEM

BER

DEC

EMBER

El

Olja

Förädlad bio

Naturgas

Värmepump

Kol

Torv

Oförädlad bio

Hetvatten

Spillvärme

Avfall


Solar heating farm for district heating -Kungälv


Seasonal storage


End


Energy consumption, project

− What effects on what ?, Specific energy per year*

− Heavier structure + 100/150 mm ~ -1 kWh/sqm

− Increase insulation, +200 mm ~ - 3 kWh/sqm

− Increase insulation, +1000 mm ~ - 5 kWh/sqm

− Increase glass, 40% - 60% ~ +7 kWh/sqm

− Increase glass, 40% - 100% ~ + 22 kWh/sqm

− Better glass, U 1,4 – 1,0 W/ ~ - 5 kWh/sqm

− Low speed AHU 2,5 – 1,6 m/s ~ - 7 kWh/sqm

− High eff AHU 60% – 85% ~ - 16 kWh/sqm

*) Base level 85 kWh/kvm GLA


− Which solution is most energy efficient ?

50 kWh/m2

80 kWh/m2

Bought energy


Power production North Europe

Power demand

Hydro power Nuclear power Coal power


− Which solution is most energy efficient ?

50 kWh/m2

80 kWh/m2

Bought energy

100% Fuel

XX%

waste heat

Primary energy

125 kWh/m2

100

40x 50 = 125

100

100x 80 = 80

80 kWh/m2

Alternative 1: Power

Alternative 2: District heating

Waste

Distribution

40%

100%

60%

100% Fuel

Documents

Developers perspective on classification as a driver …1 Jonas Gräslund 2011 05 20 Developers perspective on classification as a driver towards net zero buildings REHVA in Tallin